I.a fountain on Parnassus, sacred to Apollo and the Muses, Liv. Andron. ap. Fest. p. 310, b Müll.; Verg. G. 3, 293; Hor. C. 3, 4, 61; Stat. Th. 1, 698.—
II. Hence the adjj.,
A. Castă-lĭus , a, um, Castalian: “fons,” Plin. 4, 3, 4, § 8; Sen. Oedip. 229; cf. “fontes,” Stat. Th. 1, 565: “arbor,” the laurel, Prop. 3 (4), 3, 13. “hence, umbra,” Tib. 3, 1, 16: “antrum,” i. e. the cave of the oracle at Delphi, Ov. M. 3, 14.—
B. Castălis , ĭdis, f., Castalian: “unda,” Mart. 9, 19 fin.: “sorores,” i. e. the Muses, id. 4, 14; also as subst.: “Castalidum grex,” id. 7, 12, 10.